A Directional Chitosan Sound Sensor Based on Piezoelectric-Triboelectric Sensing

Area of Science:

• Materials Science
• Acoustics
• Biomaterials

Background:

• Anisotropic materials offer unique directional properties.
• Chitosan aerogels possess tunable structures and biocompatibility.
• Directional sound sensing is crucial for advanced acoustic applications.

Purpose of the Study:

• To construct a directional sound sensor utilizing anisotropic chitosan aerogel.
• To investigate the acoustic-electric conversion performance of the chitosan aerogel.
• To explore the potential applications in intelligent sensing and artificial cochlea.

Main Methods:

• Fabrication of an anisotropic chitosan aerogel with a lamellar porous structure.
• Characterization of the material's anisotropic mechanical and acoustic-electric properties.
• Testing the sensor's response to sound stimulation at varying frequencies and intensities.

Main Results:

• The chitosan aerogel exhibited significant anisotropic behavior, with compressive stress 2.6 times higher in the parallel direction compared to the orthogonal direction.
• The material demonstrated excellent directional acoustic-electric conversion performance.
• An optimal electrical output of 66 V and 9.2 μA was achieved under 150 Hz and 120 dB sound stimulation in the orthogonal direction.

Conclusions:

• The developed directional chitosan sound sensor shows high biocompatibility and sound sensitivity.
• The anisotropic chitosan aerogel is a promising material for directional sound sensing.
• Potential applications include intelligent sensing systems and artificial cochlea development.